Furnace door



M. T. RELLING FURNACE DOOR FIG. 1.

Maw/N 7. AiELL/Nfi,

Patented Dec. 29, 1942 UNITED STATES PATENT OFFICE FURNACE noon Martin T. Belling, Munhall, Pa. I Application January 29,1941, Serial No. 376,553

4 Claims. (01. 122498) considerably hotter and areas are provided wherein steam is formed, and this is particularly true in the case of furnace openings using two doors v wherein hot flames or hot gases tend to blow out between the abutting surfaces thereof.

It is among the objects of the present invention to provide a furnace door which is eflicient and durable in service, but one which is at the same time relatively cheap and easy to manufacture.

Another object is to provide a furnace door,

the body portion of which is constructed primarily of refractory material with means carried on at least one of the peripheral portions thereof for providing a heat-resistant seal against the escape of hot flames or gases. To the accomplishment of these andother desirable objects and purposes, I have designed the present, preferred embodiments of the invention presented in the accompanying drawing forming a part of this specification and to which reference should be had in connection with the following detailed description, and in this drawing, for simplicity, like reference numerals have been employed to designate-the same parts throughout the several views.

In this drawing:

Figure 1 is a vertical elevation of a furnace door embodying the teachings of the present invention.

Figure 2 is a sectional view on line I I II' of Figure 1.

Figure 3 is a sectional view on line III I1I of Figure 1.

Accordingly, such a furnace must provide an Opening 3 of substantial width, the usual closure therefor taking the form of a pair of cooperating doors which are generally designated herein as 5 and 5. As stated hereinbefore, these doors have in the past been formed either entirely of refractory material or have been water-cooled, the purpose being to prevent the escape of hot flames and gases, particularly at the adjacent or abutting edges of the doors. On either side of the door opening there is conventionally provided buckstays 8 carrying angles 9 for contact with the remote side edges of the doors. In addition, the tops and bottoms of the doors are provided adjacent their side faces with protecting lips, generally designated at H.

According to the foregoing construction and arrangement, it will be perceived that double doors of conventional design are provided with acceptable seals at the tops, bottoms, and remote side edges thereof; but as before stated, the chief difficulty lies in effecting an efiicient seal at the adjacent or-abutting edges of the double doors.

In accordance with the teaching of the present invention, each of a pair of furnace doors is provided on its inner edge with a pair of spaced on the door 6. This construction provides an overlap or seal,when the doors are in place, such Figure 4 is an enlarged fragmentary elevation.

Figure 5 is a sectional view on line V-V of Figure 4.

Figure 6 is a sectionalview on the line VI-"-VI of Figure 4. I

Referring more particularly to the drawing, the numeral 2 designates a furnace which, for example, may be a slab reheating furnace in a steel mill wherein the slabs are heated to temperatures in excess of 2400 degrees Fahrenheit.

as will prevent the escape of hot flames and gases and, together with the'conventional instrumentalities employed in conjunction with the other edge portions of the doors, effects a continuous covering over the entire door opening.

As shown more clearly in Figures 1 and 2, the tube I4 is directed downwardly the entire height of the door 5, turned at right angles and directed along the entire lower edge of the door, its direction reversed and continued along the entire Width of the door, where it takes the form of the pipe l5 mentioned hereinbefore.

- water such that the pipe l4 becomes the inlet,

This construction provides for the circulation of \the cooling no part of the present invention. By providing proper circulation of cooling water to only the vital points, there is reduced to a minimum the directly exposed cooling area and the elimination of the water cooling effect upon the refractory door lining, whereby the temperature drop is greatly diminished and there is obtained the benefit of a more even heating of furnace charge, accompanied by materially reduced fuel consumption.

When embodying the device of the invention on a plurality of cooperating doors, one or more may be raised or lowered independently of the others, but with such efficiency that tendencies toward door failure, such as leakage and burning out, are materially reduced.

From the drawing, it will be perceived that the tubes l1 and I8 are constructed and arranged in the identical manner of the tubes l4 and 15 on the door 5, except for the feature of partial overlapping.

While I have shown and described one specific embodiment of the present invention, it is to be understood. that the invention is not limited thereto and may be otherwise embodied within the scope of the following claims.

I claim:

1. A furnace door comprising a refractory body portion, a pair of spaced parallel exposed watercooled pipes carried on one of the edges of said door and extending substantially vertically there-.

of, a framing element for said door, and an exposed water-cooled pipe carried on the cooperating edge of said framing element and extending substantially vertically thereof, said pair of spaced parallel exposed water-cooled pipes being adapted for disposition adjacent opposite points on said last-named water-cooled pipe and in close proximity thereto.

2. A furnace door comprising a refractory body portion, a pair of spaced parallel exposed watercooled pipes carried on one of the edges of said door and extending substantially vertically thereof, a pair of water-cooled conduits disposed along the bottom of the refractory body portion of said door, said water-cooled conduits being connected to said pair of spaced parallel exposed watercooled pipes, a framing element for said door, and an exposed water-cooled pipe carried on the co operating edge of said framing element and extending substantially vertically thereof, said pair of spaced parallel exposed water-cooled pipes being adapted for disposition adjacent opposite points on said last-named water-cooled pipe and in close proximity thereto.

3. A furnace door comprising a refractory body portion, a pair of spaced parallel exposed watercooled pipes carried on one of the edges of said door and extending substantially vertically thereof, a framing. element for said door, and a pair of spaced parallel water-cooled pipes carried on the cooperating edge of said framing element and extending vertically thereof, said pair of spaced parallel exposed water-cooled pipes being adapted for disposition adjacent eitherside of one of said last-named water-cooled pipes and in close proximity thereto.

4. A furnace door comprising a refractory body portion, a pair of spaced parallel exposed watercooled pipes carried on one of the edges of said door and extending substantially vertically thereof, a painof water-cooled conduits disposed along the bottom of the refractory body portion of said door, said water-cooled conduits being connected to said first-named pair of spaced parallel exposed water-cooled pipes, a framing element for said door, and a pair of spaced parallel watercooled pipes carried on the cooperating edge of MARTIN T. RELLING. 

